2011 Lexus IS 350 Owners Manual - Page 618

If the electronic key does not operate properly n Unlocking and locking the doors To unlock or lock the vehicle, use the mechanical key to remove the lock cover on the driver's door handle. The mechanical key is stored inside the electronic key. 1 Unlocks 2 Locks n Starting the engine Depress the brake pedal (for automatic transmission) or clutch pedal (for manual transmission). Touch the Lexus emblem side of the electronic key to the "ENGINE START STOP" switch. Press the "ENGINE START STOP" switch within 10 seconds of the buzzer, keeping the brake pedal (for automatic transmission) or clutch pedal (for manual transmission) depressed. If the electronic key battery becomes depleted, replace it with a new battery. For instructions on replacing the battery, refer to the Owner's Manual. If you need further assistance, contact your Lexus dealer. 56